Drill sharpener



0d. 31, 1939. I 5, w, F|NKE 2,177,644

DRILL SHARPENER Filed July 2a, 1937 v 7 Sheets-Sheet 1 .2 i0 Z .a/ I V aFiled July 26, 1937 7 Sheets-Sheet 2 Oct. 31, 1939.

G. w. FINKE 2,177,644

DRILL SHARPENER Filed July 26, 1937 7 Sheets-Sheet 4 65 3| mwwtom 33311I V 1 14% MW Get. "31, 1939. G. w. FINKE DRILL SHARPENER Filed July 26,1937 '7 Sheets-Sheet 5 I G'eoz'ya liz-n'rzke.

Oct. 31, 1939. G. w. FINKE 2,177,644

DRILL SHARPENER' Filed July 26, 1-937 7 Sheets-Sheet 6 2- id; 74 I 3mmG'earye AZ iz'nke.

Oct. 31, 1939. G. w. FINKE 2,177,644

DRILL SHARPENER Filed July 26, 1937 7 Sheets-Sheet 7 3 vwwvbo'n Gearyeif f'z'nke Patented Oct. 31, 1939 it I 2,177,644.

UNITED STATES PATENT OFFICE DRILL SHARPENER,

George W. Finke, Moonachie Boro, N. J assignor of forty-nine per cent toBruno Concato, Moonachie Boro, N. J.

Application July 26, 1937, Serial No. 155,798

p I 13 Claims. (01. 51-120) This invention relates to an improved drillMy invention is illustrated in the several sheets sharpener and is moreparticularly adapted for of drawings forming a part of this application.use in sharpening steel twist drills, straight steel In said drawings:drills, or other drillsof similar nature. Figure 1 is a side elevationshowing my im- One object of the invention is to provide a proved drillsharpener as it would appear mountdrill sharpener which will beautomatic for proed on the edge of a table or the like and in an ducingtwo uniform cutting edges and which emoperative position.

ploys abrading stones mounted so as to describe Figure 2 is a sideelevation showing my imalternating overlapping rotating cycles acrossproved drill sharpener mounted in vertical posilo i the cutting end of adrill. tion to receive a twist drill or the like which is Another objectof the invention is to provide mounted in a vertically disposed chuck. adrill sharpener wherein the abrading stones, Figure 3 is a verticalsectional view of the in addition to rotating in a harmonious-alterdevice on the lines 33 of Figures 1 and 4, looknating, overlappingrotating movement, also, during in the direction indicated by thearrows. lasting said rotating movement, intersect a master Figure 4 is avertical sectional view on the or common center axis or vertex, whichaxis or line 44 of Figure 3, looking in the direction vertex isconcentric with the axis of the drill being indicated by the arrows.sharpened. Figure 5 is a detail plan view showing the man- A furtherobject of the invention is to provide ner of mounting the hinge membersand hinge 09a drill sharpener wherein the abrading stones yokes with theabrading stones thereon on the so employed are adjusted for permittingaccurate inner frame or bridge employed. setting thereof with relationto the end of the Figure 6' is a transverse sectional view on the drillbeing sharpened so that two uniform cutline 6--6 of Figure 5, looking inthe direction inting edges for the drill will be produced, said dicatedby the arrows.

gj-i-cutting edges having true cutting and clearing Figure '7 is adetail sectional view on the line edge characteristics. 'l! of Figure 4.

A still further object is to provide a drill Figure 8 is a transversesectional view on the sharpener of this natureemploying a guide for line88 of Figure 2. effectively guiding a drill being sharpened to Figure 9is a detail transverse sectional view go proper position, said guidebeing adjustably on the line 9-9 of Figure 2, looking in the direc- 80mounted Within the throat of the bridge emtion indicated by the arrows.ployed so that the depth of said guide may be Figure 10 is adiagrammatic view showing the effectually regulated. relation of thevarious vertices and axes on which As a still further object, theinvention seeks certain of the rotating parts operate. 5 -3-to provide adrill sharpener wherein the abrading Figure 11 is a diagrammatic topview showing stones are mounted on hinge members, which the abradingstones as they would appear with hinge members are interconnected bymeans of one of said stones in operative position and the interfittinghinge yokes on a common shaft and other of said stones in inoperativeposition.

which hinge members and yokes cooperate for Figure 12 is a diagrammatictop view showing -m0unting the weaver or planetary gear mechaboth of theabrading stones in the same relative 1U nism employed in an effectivefool-proof manner. position.

A further object of the invention is to provide Figure 13 is adiagrammatic top view showing means for permitting free movement of thehinge the abrading stones as they would appear in pomembers and meansfor adjustably locating said sition reversed from that shown in Figure11.

hinge members and hinge yokes carried thereby Figure 14 is adiagrammatic side view showing, 45 to various operative positions. bymeans of small triangles representing shafts And the invention has as astill further object at right angles to the main axis or vertex, the toprovide a drill sharpener having a weaver or relation and position ofsaid shafts or right anplanetary gear mechanism which will travel ingularly disposed axes to the main axis or vertex.

03a stationary ring gear for permitting the proper Figure 15 is adiagrammatic top view of the planetary movement of the'abrading stonesemsubject matter shown in Figure 14. ployed, Figure 16 is a sideelevation showing a plurality Other and incidental objects of theinvention of guides which are of uniform exterior diameter notheretofore mentioned will become apparent but are adapted to receivedrills of different sizes. x'fduringthe course ofthe'following-description. Fig e 17 is a diagramma V w Showing the illtatably mounted in the closure ring I5. Said relation between thecutting edges and rakes of the drill and the abrading stones andparticularly showing the various relative angles.

Referring now more particularly to the drawings, wherein, as will beseen, similar reference numerals designate like parts throughout thevarious views, the numeral I indicates in general the casing of myimproved drill sharpener. The casing is preferably circular in shape andis provided with a relatively large inner end portion 2. The casing isreduced in diameter substantially above its mid-portion to form anintermediate portion 3 and said casing is further reduced above saidmidportion to define a neck 4. The inner portion 2, as best seen inFigures 1 and 2 has a mounting plate 5 which surrounds substantiallyhalf the circumference of the casing at said inner portion and issecured thereto by means of screws 3. The mounting plate 5 has anintegral mounting pin 1.

As shown in Figure 1 of the drawings, my improved drill sharpener may bemounted horizontally by engaging the pin 'I'ina suitable bracket 8 whichis appropriately secured to the edge of a table or bench 3. The bracket8 will be capable of rigidlyjholding the casing so as to preventmovement thereof with the pin I. Formed in the intermediate portion 3 ofthe casing I are slots 5 which extend laterally with respect to thelength of the casing and are adapted to permit entry of suitable toolsfor the adjustment of certain parts of the invention to be describedhereinafter. The casing as closed at its larger or rear end by means ofa removable rear wall I I which is held in place on the casing I bymeans of mounting screws I2. By referring to Figures 3 and 4 of thedrawings, it will be seen that the inner portion 2 is thickened at I3 toreceive the mounting screws I2. Formed axially in the re-' movable rearwall II is a bearing I4. Carried at the other end of the casing I andscrewed into the neck 4 is a closure ring I5 which is of substantiallyinverted step shape in cross section and which is held againstaccidental displacement from the neck 4 by means of a locking bolt I3.The closure ring defines a bearing. 7

, Rotatably mounted in the casing I and adapted to extend throughout themajor portion of the length of said casing is an inner frame or bridgeI? which is provided with a neck portion I3 roneck portion I8 defines ashoulder I9 which engages theunder side of the stepped surface of theclosure ring so that said closure ring cooperates with the shoulder toprevent accidental upward displacement of the inner frame in the casing.The inner frame I I is provided with mounting portions 29 and 2I andsaid neck portion is formed with an axial openingZZ, which openingextends throughout the length of said neck portion.

The neck portion I 8 of the frame I1 is adapted to removably receive inthe axial opening 22 a tubular or sleeve-shaped guide 23 which isprovided throughout the outer half of its length with threads 24. Anadjusting ring 25 is screwed on the threads 24 of the guide 23 and has;a reduced inner ring portion 26 provided with spanner teeth 21.Asclearly seen in Figures 1, 2, 3 and 4 of the drawings,- the inner ringportion 26 is adapted to be associated in close spaced relation with theupper end of the neck portion I8 of the inner frame or bridge I'I', Theupper end of said neck portion I8'is formed with an annular slot 28which defines a rim 29 of the same thickness and cross sectional contouras the inner ring portion 26. As best seen in Figures 1, 2, 3 and 9,there is provided a locking fork 30 ,Which is formed with a handleportion 3| and in proper. relation to the upper end of the inner frameor bridge II. Inwardly of the handle portion SI of the locking fork 33and integral with said handle portion is a locking tooth 34 which isadapted to engage certain of the spanner teeth for holding the adjustingring 25 and the rim 29 against relative rotative movement.

By referring to Figure 8 of the drawings, it will be clearly seen thatthe guide 23 is provided with curved guideways 35 which are adapted toreceive and tightly hold against rotative movement in said guide, adrill 3G to be sharpened. Thedrill may, as heretofore stated, be of thesteel twist drill type or may be merely a straight drill, although itshould be understood that I do not limit myself in any way as to theparticular type of drill which may be sharpened as it will be readilyseen that my invention may be adapted for sharpening various types ofdrills. The guide 23, with the drill 35 therein, is raised and loweredin the casing by means of the adjusting ring 25 which is screwed on thethreads 24 of the guide. The depth of the guide .is controlled by thefork 30. so that easy control will be provided.

The inner frame IT is formed, beneath the mounting portions 2Ila'nd 2|with straight walls 37 and 38 and the frame is provided with a commonbottom wall 39 which connects the lower end portions of the walls 37 and38. The wall 39 is formed with 21. depending stud 40. The dependingstudis adapted to be rotatably mounted in the hub II of a base driving gear42. -The base driving gear extends throughout the lower or inner portionof the casing I and is provided with an outwardly inclined wall 43formed with beveled teeth 44. interposed between the base driving gear42 and the removable rear wall II, and surrounding the hub M in closerelation thereto is a check spring 45 which engages the gear and limitssaid gear to unidirectional rotation.

The common bottom wall 39 has upstanding mounting arms 43 and 41 whichare disposed in parallel spaced relation to each other and to thestraight walls 3? and. 38. The upstanding mounting arms cooperate withtheir associated straight Walls to define yokes 43- and 43 and a spacebetween said yokes. the straight wall 31 and the upstanding mounting arm46 cooperate to form one yoke while the straight, wall 38 cooperateswith the mount-arm 41 to define the other mounting yoke. Extendingtransversely through the walls 37 and 38 and terminati-ngadjacent theouter surfaces of the In other words, j

at theirrespective outerends with beveled gears 58 and 59 adapted tomesh with the teeth 44-of the base driving gear 42. The shafts 56 and 51areprovided at their, corresponding inner ends n Wi hini g e 5 wi h. r ii ns 0 of the bushing sleeve. 52.

in order that the proper relationship between the and BI which, aswillbeseen by referring to Figures 3 I and a 6 of the, drawings, aredisposed in parallellspaced relation to each other in said space 50.'-,'I-he beveled gears 58 and 59 are adapted to be rotated by said basedriving gear 4210K. transmittingrotative movement to the drivingpinions. and BI. The base driving gear 42 is adapted to be rotated bymeans of a handle indicated in. general at 62. The handle includes athreaded shank 63, which is screwed into the hub4I, and a body portion64, said body portion having a handle member 65 which is manuallyengageablefor permitting turning of the handle, the basedriving gear,the gears 58 and 59, and the driving pinions60 and 8|.

' 'As best seenin Figures 3 and 6 of the drawings, themounting portions20 and 2| of the inner frame I! are thickened toward their lower endsand are reduced to define adjusting blocks 60 and. 81 which. areprovided with internally threaded openings 68.

Hingedly mounted on the bushing sleeves 5| and 52 within the yokes 48and 49 respectively, are abrading stone units 89 and I which are, asseenin Figure ,6, obliquely disposed with respect to the axes of the stubshafts 56 and 51. The'abrading stoneunit 89 is formed with spaced. hingeears 1| and. .12, the hinge ear TI journaling the outer portion of thebushing sleeve While the ear 12.journals the inner end portion Theabrading stone unit it. carries hinge ears I9 and I4, the ear I3 beingdisposed in parallel close relation to the ear 1| while the ear I4 isdisposed in like relation to the ear: 12. The abrading stone unit 69 isprovided, adjacent'the hingeear II, with an adjusting bolt opening "I5while the abrading stone unit is provided adjacent the ear I4 with anadjusting bolt 18. It will be understood that the abrading stone'unitswill be adapted to swing toward, andaway fromeach other on the bushingsleeves 5| and 52. However, an adjusting bolt, such asshown at 71 infull lines in Figure 3, and in dotted lines in Figure 4, is passedthrough each ofthe openings 75 and "I8 and into the threaded adjustingblocks .66 and 61 respectively. Tightening or loosening of the adjustingbolts will serve to move the units 89 and I0 toward or away from eachother about a pivot defined by the bushing sleeves 5| and 52.

' Formedvin. the abrading stone units 69 and 10 are circular openings 18and I9 which are adapted toreceiveabrading stone mechanism to bedescribed presently. The abrading stone mechanism ineach unit is ofidentical construction but units may always be kept in mind themechanism of both of said units will be described together. 1 I vRotatably mounted in the openings I8 and I9 are circular mounting blocks80 and 8| which are adapted to carry threaded upper end portions 82 and83. The threaded upper end portions areadapted to have screwed thereonbearing rings 84 and 85 held in place by locking rings 86. The blocksare formed withfianges 81 which define bearing races 88 adapted toreceive ball bearings 89. It will be understood that the circularmounting blocks will be effectively rotatably mounted in the openings I8and). The openings ,18 and I9 have shoulders 81 formed therein .and saidshoulders are adapted to reoeive .a circular ring gear 88 held againstrotation on the-shoulders and in the abrading stone units 69 e ema mens. of .ke ...Ih c u mounting blocks 80 and 8|, as best seen in Figure 7of the drawings, are provided with recesses 90 and 9| which receiverotatably therein pinions 92, which pinions are mounted on axis bolts94, which bolts extend eccentrically into the circular mounting blocks.The relatively long axis bolts 94 cooperate with assembly bolts 95 foreffectually securing a spiral gear 96 to each of the mounting blocks sothat each mounting block will turn with each spiral gear as a unit. Thespiral gears 96 are adapted to mesh with the spiral gears 60 and 8|which are mounted on the stub drive shafts 50 and 51. That is to say, inview of the fact that the units 89 and 10 are disposed slightlyobliquely with respect to the longitudinal axes of the stub driveshafts, one of the spiral gears 96 will be caused to mesh with the gear80 while the other of said spiral gears 96 will be caused to mesh withthe gear 6|. One stub drive shaft will, therefore, transmit rotativemovement to the circular mounting block 80 while the other of said stubdrive shafts will transmit rotative movement to the circular mountingblock 8|.

Formed in the circular mounting blocks eccentrically thereof, arerecesses 91, and extending through said recesses axially thereof andthrough the mounting blocks are stone mounting shafts 98. The stonemounting shafts are threaded at their upper ends, as shown at 99, andhave screwed thereon bearing rings I00 held in place by means of lockingrings IOI. Ball bearings I02 are located in the recesses between therings I00 and the shoulders of said recesses, and said ball bearingscooperate with the rings and recesses for providing smooth runningbearings for the forward ends of the stone mounting shafts 98. Keys I03serve to lock the bearing rings M0 and the shafts 98 against relativerotative movement. The corresponding outer ends of the stone mountingshafts 98 are journaled by bearings I04 which are formed on cup-shapedhousings I05 adapted to overlie the outer surfaces of the spiral gears98. Fixed to rotate on the upper or outer corresponding ends of thestone mounting shafts 98 are substantially frusto conical abradingstones I06 and I01. Mounted on the shafts 98 within the recesses 9| inthe circular mounting blocks and keyed to said shafts are pinions I08and I09 which are adapted to mesh with the pinions 92. The pinions 92',of course, mesh with the teeth of the ring gear 88. The shafts 98 arethreaded at their inner or lower ends, as shown at 98a, and saidthreaded portions have screwed thereon locking nuts 9812.

In operation, the drill to be sharpened is, as shown in Figures 1, 2 and4 of the drawings, first placed in the guide 23. The drill will be heldagainst rotation in the guide. The adjusting bolts 'II are shifted forpositioning the abrading stones I08 and I0! in proper angular relationin engagement with the cutting surfaces of the drill to be sharpened.The handle 62 is then rotated for transmitting rotative movement fromthe gear 42 to the beveled gears 58 and 59 and thence through the shafts56 and 5! to the driving pinions 60 and 6|. From the driving pinions,rotative movement is transmitted respectively to the spiral gears 96carried by the circular mounting blocks 80 and 8|. As the circularmounting blocks rotate within the abrading stone units, the pinions 92will transmit rotative movement to the pinions I08 and I09 for rotatingthe stone mounting shafts 98 and the stones thereon for eifecting thesharpening operation. As the stones rotate, due to the fact that, Iemploy thepinions 92 and I08 and 109', they will be causedto be moved inharmonious, alternating, overlapping, planetary cycles across thecutting surfaces of the drill for effectively sharpening the drill.

In the form of the invention shown in Figure 2, the handle is notemployed and the base will be maintained stationary by means of theintegral mounting pin '1. This form of the invention is to be employedwhere a breast drill in a vertical chuck is to be sharpened. In bothforms of the invention, the check spring member #5 will cooperate withalikecheck spring member M0 for limiting the rotating parts tounidirectional movement.

Referring now to the diagrammatic views and particularly to Figure 10 ofthe drawings, this view shows the diagrammatic relation of the variousparts. For example, the numerals iii, H2, H3, and lid indicate theapproximate elevations for the variable adjusting ring 25 and lookingfork 3E) and the closure ring or bearing it, which bearing i5 is, ofcourse, adjustable. The numeral H5 indicates the approximate elevationor point where the working faces of the stones fill? and if)? passthrough the master axis or vertex which is coincidental with that of thedrill being sharpened. The lines iifi and ill are drawn to indicatediagrammatically the relative positions of the stone mounting shafts 98to each other. Figures 11, 12 and i3 illustrate diagrammatically thevarious operative positions of the stones and show clearly that when oneof said stones moves inwardly across the axis of the drill or mastervertex, the other of said stones will move away from said master vertexand vice versa.- Figure 14 is a View of the same general type as'Figure10 but shows, at H9, the axes of the stub drive shafts tit and 57 aswell as a line 122% indicating the base elevation. The axes H9 and thebase elevation @263 will serve to cooperate with the other lines forindicating the proper relation of the various axes. It is thought thatthese diagrammatic views will be of aid in ascertaining the relationshipof the axes of the various shafts to each other. Figure 15 is, ofcourse, a top view of the diagrammatic matter shown in Figure 14.

As seen in Figure 16 of the drawings, the drill guides, which areshown-at H0, lH, H2, are of uniform exterior dimensions but are adaptedto receive drills ofdifferent sizes. In other words, a drill guide maybe provided for each size of drill to be sharpened and all that it isnecessary to do is to place the desired guide in position to receivesaid drill.

In Figure 17 of the drawings, there will be seen a diagrammatic viewshowing in topplan the relative positions and angles between the rakesand cutting edges of a drill and the abrading stones. It should beunderstood that the stones are so positioned as to cooperate with thecutting edges of the drill for effecting the most efficient sharpeningof said edges. It should be further understood that the abrading stonesmay be shifted to suit individual conditions and, moreover, said stonesmay be interchanged when necessary. That is to say, by shifting thestones farther apart, or nearer a one hundred and eighty degree anglewith respect to each other, larger stones will be required to effect thesharpening of the end of the drill. A different angle of cutting edgewill, however, be provided. There is no limit to the flexibility of thedevice in that any suitable angle between the stones and any desired 9size of stones may be'employed. The flexibility of the device is onlylimited by its mechanical dimensions but it is safe to say that anyreasonable angle between the stones may beassumed for providingpractically any suitable angle or cut-' ting edge desired.

It is believed that theconstruction'and opera.- tion of my improvedautomatic drill sharpener will be thoroughly understood fromthe-foregoing description so that further explanation is deemedunnecessary.

Having thus described the invention, what I claim is: V v

1. In a drill sharpener, a casing, an inner frame rotatable in thecasing, a guide carried by the inner frame for supporting a drill to besharpened, abrading means, means, rotatably mounting the abrading meanson the inner frame in a position to engage the drill to be sharpened,means for rotating the abrading means and sharpening the drill, and anadjusting ring'carried on the guide and the inner frame and beingoperative for shifting the position of the drill relative to saidabrading means.

2. In a drill sharpener, means mounting a. drill to be sharpened,"sharpening means, means mounting said sharpening means in position for adrill sharpening operation, means for rotating said sharpening means andeffecting the sharpening of the drill, and means for moving thesharpening means eccentrically in alternating overlapping planetarycyclesalternately intersecting the axis of the drill during thesharpening operation whereby uniformgrinding of the cutting'edges ofsaid drill will take place.

8. In a drill sharpener, a casing, an inner frame rotatably mounted inthe casing, a guide carried by the inner frame and having guideways,said guide and guideways being adapted to hold against rotation a drillto be sharpened, abrading stone units carried by the inner frame,abrading stones carried thereby and being adapted to engage the end ofthe drill, means carried by the.

units and said inner frame for rotating the stones and simultaneouslymoving said stones across the end of the drill eccentrically inoverlapping planetary cycles alternately intersecting the axis of thedrill, and means forrotating said last mentioned means.

4. In a drill sharpener, a casing, an inner frame rotatably mounted inthe casing, a guide carried against rotation a drill to be sharpened,means permitting vertical adjustment of the guide, abrading stone unitscarried by the inner frame, abrading stones carried by said units andbeing adapted to'engage the end of the drill, planetary gearing carriedby-the units, gearing carried by the inner frame and adapted to meshwith said planetary gearing-for effecting rotation of the abradingstones, and means engageable with said last mentioned gearing forcausing rotationof all of said gearing and said stones andsimultaneously moving said stones eccentrically across the cuttingsurfaces of the drillin overlapping planetary cycles intersecting theaxis of the drill whereby said cutting surfaces will be uniformlysharpened.

5. In a drill sharpener, a casing, an inner frame -rotatably'mounted inthe casing, means limiting said inner frame to unidirectional rotativemovement, means carried by the casing and adjustably mounting therein adrill to be sharpened, abrading stone units hingedly connected with theinner frama abradin'g' stones-carfthe cutting surfaces of 2,177,644 ried' by' said units, means carried by said abrading stone units and'saidframe and being adjustable for permitting'adjustments in the setting' ofsaid abrading stone units with respect to a drill, ring gears carried bytheabrad'ing stone units, circular mountfi'ng blocks, abrading stonescarried by said blocks,

jpinions carried by said blocks, a shaft connecting certain of saidpinions'with the abrading stones,

-spiral "gears carried by the mounting blocks, means carried by theinner frame and engageable with the spiral gears for transmittingrosecting the axis of the drill, and means limiting supporting thecasing on a surface, means for said last mentioned means tounidirectional rotation, v I

6. In a drill sharpener, a casing, means for supporting in the casingadrill to be sharpened, rotatable sharpening means in the casing andbeing adapted for grinding't'he cuttingsurfaces of the drill, and ahandle carried by the casing for rotating said last mentioned means foreffecting a sharpening operation, said rotatable sharpening meanscomprising rotatable stones adjustable for varying the included anglebetween the end surfaces of said stones at the axis of the drill wherebythe cutting surfaces of the drill may be ground to suit varyingconditions.

7. In a drill sharpener, a casing, means for supporting the casing on asurface, means for supporting in the casing a drill to be sharpened,rotatable sharpening means in the casing and being adapted to engage thecutting surfaces of the drill, and a handle carried by the casing andbeing adapted to rotate said last mentioned means for effecting asharpening operation, and means for shifting said rotatable sharpeningmeans to move simultaneously in eccentric cycles obliquely to the axisof the drill and alternately to overlap I said axis.

8. In a drill sharpener, a casing, an inner frame in the casing, meansmounting the inner frame in the casing, means limiting the frame tounidirectional rotation in the casing, a guide carried by the frame andbeing adapted to retain a drill to be sharpened in position, abradingstone units hingedly connected with the inner frame,

abrading stones carried by said units, means for adjusting said units topermit proper angular disposition of said stones to engage the cuttingsurfaces of the drill, a base driving gear, means rotatably connectingsaid driving gear with the stones, and means for rotating said drivinggear and last mentioned means for imparting rotative and eccentricmovement to said stones whereby said stones will be caused to sharpenthe drill.

9. In a drill sharpener, a casing having a rear wall having a bearing, adriving gear rotatable in the bearing and having a hub, a handle forrotating the driving gear, a closure ring at the opposite end of thecasing defining a bearing, an inner frame having a neck portionjournaled by the closure ring and. a depending lug journaled by the hub,a guide carried by the neck portion" and being adapted to receive adrill to be sharpened, means carried by the neck portion and casing foradjusting the guide in said neck portion, means carried by the closurering for limit.. ing said inner frame to unidirectional rotation, meansabout the driving gear hub for limiting said driving gear tounidirectional rotation, an abrad- 'tric sharpening motion to the thesharpening of the drill.

ing stone unit, a bushing sleeve hingedly mount ing the abrading stoneunit on the inner frame, a stub drive shaft, a circular mounting block,a stone mounting shaft, an abrading stone carried thereby and adapted tobe engaged with the drill, I

and gearing carried by said unit and said stub drive shaft and beingadapted to cooperate with the driving gear for imparting a rotativeeccenstone for effecting 10. In a drill sharpener, a casing, an abrading7 stone unit in the casing and having an opening,

a circular mounting block rotatably carried in the opening and havingrecesses, a spiral gear carried by the mounting block, a ring gearcarried by the unit adjacent the opening, means limiting said ring gearagainst rotation relative to the unit, a pinion in one of said recessesand meshing with the ring gear, means rotatably mounting the pinion inthe recess, a stone mounting shaft,

means carried by the mounting block and journaling one end of the shaft,an abrading stone carried by said shaft, a pinion carried by said shaftand being adapted to mesh with said first mentioned pinion, and meanscarried in the casing and operatively engageable with the spiral gearfor rotating said spiral gear whereby rotative movement will betransmitted through the pinions to the stone mounting shaft and stonefor causing said stone to rotate on its own axis and eccentricallyrelatively to the opening in the unit, said stone being adapted foruniformly grinding the sharpening surface of a drill held in the casing.

11. In a drill sharpener, a casing, a closure ring closing the casing atone end and defining a bearing, an inner frame carried by the casing andjournaled at one end by said bearing, means within the casing journalingthe opposite end of said inner frame, said frame having a neck portionprovided with a rim and an axial opening, a guide carried in said axialopening and having external threads, an adjusting ring carried by saidguide on said threads and having an inner ring portion formed withspanner teeth, a locking fork having arcuate channel shaped legsstraddling the rim and said inner ring portion, said locking fork havinga locking tooth engageable with one of said spanner teeth and saidlocking fork being adaptable for regulating the depth of the guidewhereby the position of a drill to be sharpened and carried in the guidemay be regulated, and means in the casing engageable with the cuttingsurfaces of the drill for sharpening said surfaces.

12. In a drill sharpener, a casing having a removable inner wallprovided with a bearing, a closure ring closing the casing at itsopposite end, an inner frame rotatably mounted in the casing and havingone end joumaled by said closure ring, a base driving gear carried inthe casing and having a hub journaled by said bearing, said inner framehaving upstanding mounting arms and a common bottom wall, said commonbottom wall being provided with a depending lug journaled by said hub toform a bearing for the inner end of said inner frame, said upstandingmounting arms cooperating with side portions of the inner frame todefine yokes, bushing sleeves carried by the side portions of the innerframe and extending to the upstanding arms, abradin stone units carriedby the inner frame and having hinge ears swingingly mounted on saidbush1ng sleeves, stub drive shafts carried in the bushing sleeves,beveled gears carried by said stub d We shafts, said beveled gears beingadapted to r Esh withsaid base driving gear, driving pinions carried bysaidstub drive'shafts, circular mounting blocksrotatably mounted in theabrading stone units, ,spiral gears carried by said circular mountingblocks and being adaptedto mesh with said first mentioned spiral gears,one of said spiral gears on one mounting block being adapted to meshwith one of the spiral gears on one of said stub driving shafts and theother of said spiral gears on the other of said circular mounting blocksbeing adapted to mesh with the other spiral gear on the other of saidstub driving shafts, said mounting blocks having recesses,

'pinions carried in the recesses, ring gears fixed to the abrading stoneunits and being adapted to mesh with the .pinions, stone mounting shaftsjournaled in the circular mounting blocks and having pinions meshingwith said first mentioned pinions, abrading stones carried by said stonemounting shafts and being adapted to engage a drill in the caseforsharpening said drill, all of said gears being adapted to transferrotative movement to the abrading stones, said abrading stones beingadapted to rotate on their axes and being adapted to move eccentricallywithin the abearing, an inner frame having one end jour-.

naled byssaid closure ring, means carried at the other end-of saidcasing for journaling the other end of saidinner frame, said closurering being adjustable for retaining the inner. frame properly rotatablymounted inthe casing, means carried by the casing forretaining theclosure ring in an adjusted position, means limiting the inner frame tounidirectional rotation, a guide carried by the inner frame and havingguideways for receiving a drill to be isharpene.d,.means carried 'by theguide and saidinner frame for regulating the depth of said guide withinthe casing, and means carried by the inner frame and engageable with -gocutting surfaces of thedrill and being rotatable and having simultaneousplanetary overlapping movement intersecting the axis of the drill forsharpening said drill.

GEORGE W. FINKE.

